javascript - 使用 Breeze.js 取消订阅所有属性更改事件

Question

遵循有关订阅更改单个实体事件的文档很容易 -

    var token;
    var myEntity  = ko.observable();
    if (token == null) {
        token = myEntity().entityAspect.propertyChanged.subscribe(function (changeArgs) { trackChanges(changeArgs); });
    }

但是，如果我想订阅 observableArray 并跟踪令牌

    var tokens = ko.observableArray();
    var myEntitys = ko.observableArray();
    if (tokens().length === 0) {
        ko.utils.arrayForEach(myEntitys(), function (entity) {
            var etoken = entity.entityAspect.propertyChanged.subscribe(function (changeArgs) { trackChanges(changeArgs); });
            tokens.push(etoken);
        });
    }
    console.log(tokens());

订阅工作正常，但每个令牌都等于相同的值

    //This works fine
    myEntity().entityAspect.propertyChanged.unsubscribe(token);

    //**This does not work because myEntitys does not have an entityAspect, of course **
    ko.utils.arrayForEach(tokens(), function (token) {
        myEntitys().entityAspect.propertyChanged.unsubscribe(token);
    });

    //This works, but I am not sure why because token was set above to equal a single entity (myEntity())
    ko.utils.arrayForEach(myEntitys(), function (entity) {
        entity.entityAspect.propertyChanged.unsubscribe(token);
    });

有没有办法在离开视图时取消订阅一切，或者有一种适当的方法来做我上面尝试的事情？如果我再次重新加载相同的视图，它将双重订阅 propertyChange 事件。

Answer 1

我们能够重现该问题并正在调查该问题。